U.S. patent application number 16/061838 was filed with the patent office on 2018-12-20 for electromagnetic actuator as well as actuating system.
This patent application is currently assigned to ETO Magnetic GmbH. The applicant listed for this patent is ETO Magnetic GmbH. Invention is credited to Stefan Bender, Harald Eckhardt.
Application Number | 20180366249 16/061838 |
Document ID | / |
Family ID | 57544390 |
Filed Date | 2018-12-20 |
United States Patent
Application |
20180366249 |
Kind Code |
A1 |
Eckhardt; Harald ; et
al. |
December 20, 2018 |
ELECTROMAGNETIC ACTUATOR AS WELL AS ACTUATING SYSTEM
Abstract
An electromagnetic positioning device (1), having a stationary
spool unit (9), having a moveably guided anchor (2), which forms a
positioning section (14) and which can be axially displaced along a
displacement axis (V) in response to supplying the spool unit (9)
with current, as well as having a one-part cup-shaped yoke-core
element (3), which receives the anchor (2) and which includes a
core section (5) as well as a yoke section (6) and which has a
yoke-core bottom (4) extending perpendicular to the displacement
axis (V) and a yoke-core sheath extending perpendicular to the
yoke-core bottom (4) along the displacement axis (V), a
longitudinally cut transition area (8) reduced in thickness and
arranged between the core section (5) and the yoke section (6)
being realized in the yoke-core sheath. It is intended that a guide
pin (17) for the anchor (2) is fixed, preferably pressed in, in a,
preferably centric, guide pin recess (18) in the yoke-core bottom
(4) and protrudes axially into a, preferably centric, guide opening
(13) of the anchor (2) and can be displaced relative to the anchor
(2) during its displacement movement.
Inventors: |
Eckhardt; Harald;
(Uhldingen-Muhlhofen, DE) ; Bender; Stefan;
(Engen, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ETO Magnetic GmbH |
Stockach |
|
DE |
|
|
Assignee: |
ETO Magnetic GmbH
Stockach
DE
|
Family ID: |
57544390 |
Appl. No.: |
16/061838 |
Filed: |
November 23, 2016 |
PCT Filed: |
November 23, 2016 |
PCT NO: |
PCT/EP2016/078514 |
371 Date: |
June 13, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01F 7/13 20130101; H01F
2007/163 20130101; H01F 7/081 20130101; H01F 2007/085 20130101;
H01F 7/1607 20130101 |
International
Class: |
H01F 7/16 20060101
H01F007/16; H01F 7/08 20060101 H01F007/08 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 14, 2015 |
DE |
10 2015 121 707.4 |
Claims
1. An electromagnetic positioning device (1), having a stationary
spool unit (9), having a moveably guided anchor (2), which forms a
positioning section (14) and which can be axially displaced along a
displacement axis (V) in response to supplying the spool unit (9)
with current, as well as having a one-part cup-shaped yoke-core
element (3), which receives the anchor (2) and which comprises a
core section (5) as well as a yoke section (6) and which has a
yoke-core bottom (4) extending perpendicular to the displacement
axis (V) and a yoke-core sheath extending perpendicular to the
yoke-core bottom (4) along the displacement axis (V), a
longitudinally cut transition area (8) reduced in thickness and
arranged between the core section (5) and the yoke section (6)
being realized in the yoke-core sheath, wherein a guide pin (17)
for the anchor (2) is fixed in a guide pin recess (18) in the
yoke-core bottom (4) and protrudes axially into a guide opening
(13) of the anchor (2) and can be displaced relative to the anchor
(2) during its displacement movement.
2. The electromagnetic positioning device (1) according to claim 1,
wherein on the yoke-core element (3), a sliding bearing (21) is
fixed for guiding the anchor (2) on its outer circumference.
3. The electromagnetic positioning device according to claim 1,
wherein an anti-twist pin (16) extending parallel to the guide pin
(17) is arranged adjacent to the guide pin (17) and is fixed in an
anti-twist pin recess (19) in the yoke-core bottom (4).
4. The electromagnetic positioning device according to claim 1,
wherein the yoke-core bottom (4) forms a direct or indirect axial
terminal abutment for the anchor (2) or a support surface for an
abutment attenuation element.
5. The electromagnetic positioning device according to claim 1,
wherein the anchor (2) is axially arranged between the yoke-core
bottom (4) and a washer element (25) penetrated by the anchor (2),
said washer element (25) being fixed in an inner circumferential
groove (26) of the yoke-core element (3).
6. The electromagnetic positioning device according to claim 5,
wherein the washer element (25) is realized as a spring lock
washer.
7. The electromagnetic positioning device (1) according to claim 1,
wherein on the anchor (2), an abutment attenuation element is fixed
via which the anchor (2) is supported in at least one terminal
abutment position on an immobile component.
8. The electromagnetic positioning device according to claim 1,
wherein in its positioning section (14), the anchor (2) carries a
rolling bearing (15) realized as a ball bearing.
9. The electromagnetic positioning device according to claim 1,
wherein the anchor (2) is made of multiple parts and comprises a
guide section (12), which comprises the guide opening (13) and on
which a push rod section, which comprises the positioning section
(14) and which is made of one or multiple parts and has a smaller
diameter than the guide section (12), is fixed.
10. The electromagnetic positioning device according to claim 1,
wherein the spool unit (9) is supplied or can be supplied with
current via a control in such a manner that the anchor (2) moves
axially along the displacement axis towards the yoke-core bottom
(4) upon supply with current.
11. The electromagnetic positioning device according to claim 1,
wherein the yoke-core element (3) and the spool unit (9) are
arranged in a current-conductive casing (10).
12. A positioning system, comprising an electromagnetic positioning
device (1) according to claim 1, as well as a positioning partner,
which is realized in the anchor (2) so as to introduce a torque
around the displacement axis (V) via a rolling bearing (15) fixed
on the anchor (2).
13. The electromagnetic positioning device according to claim 1,
wherein an internal sliding bearing is arranged on the anchor (2)
in order to axially guide the anchor (2) on the outer circumference
of the guide pin (17).
14. The electromagnetic positioning device according to claim 1,
wherein the slide bearing (21) is fixed on the inner circumference
of the yoke section (6).
15. The electromagnetic positioning device according to claim 6,
wherein the spring lock washer is made of a material which does not
conduct magnetic flow.
16. The electromagnetic positioning device according to claim 15,
wherein the material is bronze.
17. The electromagnetic positioning device according to claim 9,
wherein the guide opening (13) is a through opening.
18. The electromagnetic positioning device according to claim 9,
wherein the push rod section is fixed in the guide opening (13).
Description
BACKGROUND OF THE INVENTION
[0001] The invention relates to an electromagnetic positioning
device, in particular a pull device, having a stationary spool
unit, having a moveably guided anchor, in particular a pull anchor,
which forms a positioning section and which can be axially
displaced along a displacement axis in response to supplying the
spool unit with current, as well as having a one-part cup-shaped
yoke-core element, which receives the anchor and which comprises a
core section as well as a yoke section and which has a yoke-core
bottom extending perpendicular to the displacement axis and a
yoke-core sheath extending perpendicular to the yoke-core bottom
along the displacement axis, a longitudinally cut transition area
reduced in thickness and arranged between the core section and the
yoke section being realized in the yoke-core sheath.
[0002] Such positioning devices, which are described in DE 10 2006
015 233 B4 by the same applicant, for example, are optimized and
adapted to the respective positioning task in regard of the
geometry for casings, cores, yokes and anchors. Owing to the
provision of a one-part yoke-core element, the positioning device
known from the aforementioned document is suitable for being mass
produced in an automated fashion in contrast to the positioning
devices described in DE 198 82 903 T1 or DE 202 18 782 U1, in which
separate core and yoke elements are intended.
[0003] In spite of the generally good suitability for the mass
production of the generic positioning device comprising a one-part
yoke-core element, improvements regarding the mass production are
continuously sought for, in particular for electromagnetic
positioning devices which are not designed as pressure positioning
devices contrary to the positioning device described in DE 10 2006
015 233 B4 but are rather designed as a pull device comprising a
pull anchor.
SUMMARY OF THE INVENTION
[0004] Starting from the aforementioned state of the art, the
object of the invention is therefore to indicate an electromagnetic
positioning device suitable for mass production which is
characterized by a good suitability for automatable production
while simultaneously having a minimized assembly space. In this
context, the electromagnetic positioning device is to be realized
as a pull device in a preferred embodiment, in which the anchor
forming a pull anchor is displaced towards the yoke-core bottom
upon supplying the spool unit with current. Even more preferably,
in the scope of a positioning system, the electromagnetic
positioning device is to also be used for applications in which a
torque is applied to the anchor, in particular via the positioning
partner, and acts to rotate the anchor around its displacement
axis, in particular at a high rotation.
[0005] In regard of the electromagnetic positioning device, the
object is attained by the features disclosed herein, i.e. in a
generic positioning device by a guide pin for the anchor being
fixed, in particular by being pressed in, in a, preferably centric,
guide pin recess in the yoke-core bottom, said guide pin protruding
axially into a, preferably centric, guide opening of the anchor and
being displaceable relative to the anchor during its axial
displacement movement.
[0006] When realizing the positioning device according to the
invention as a pull device, the anchor can also be moved away from
the yoke-core bottom in different manners, e.g. by a polarity
reversal of the current supply of the spool unit and/or by a spring
force tension of an optionally provided return spring and/or by a
tensile strength exerted by the positioning partner.
[0007] Further advantageous embodiments of the invention are
described in the dependent claims.
[0008] In an advantageous manner according to the invention, a
plurality of functions of the positioning device is realized in a
multifunctional assembly whose rotation point and pivotal point is
the one-part yoke-core element. Hence, it is intended according to
the invention that besides a magnetic flow conducting function and
a flow coupling function of the core section for coupling the
magnetic flow into the anchor, the yoke-core element also has a
carrier function or rather a holding function for holding a guide
pin for the anchor by the yoke-core bottom, which extends
perpendicular to the displacement axis and which preferably
simultaneously forms an abutment for delimiting the axial
displacement movement of the anchor, comprising a, preferably
centric, guide pin recess in which a guide pin is fixed, preferably
by being pressed in, which protrudes into a corresponding,
preferably centric guide opening of the anchor upon its axial
displacement movement, in particular via the entire maximal
displacement distance, and which extends parallel to the
longitudinal extension of the sleeve-shaped yoke section.
[0009] As an additional function of the one-part yoke-core element,
it is intended in an embodiment of the invention for the yoke-core
element to provide a carrier surface or rather holding surface for
a sliding bearing, in particular on its inner circumference, more
preferably on the inner circumference of the yoke section arranged
axially adjacent to the core section, said sliding bearing being
fixed by being pressed in and/or by being glued and/or by being
soldered and/or in a different manner to the yoke-core element and
said sliding bearing guiding the anchor on its outer circumference
during its axial displacement movement.
[0010] In summary, it is intended according to the embodiment that
essential guide functions for the anchor, preferably realized or
controlled as a pull anchor, are focused on the yoke-core element,
which is a direct carrier for a guide pin for guiding the anchor on
its inner circumference as well as a carrier for a sliding bearing
for guiding the anchor on its outer circumference.
[0011] Owing to the use of the one-part yoke-core element according
to the invention, a magnetic short circuit occurs in the transition
area between the core and the yoke and allows magnetic satiation in
this transition area preferably even at low spool currents, whereby
negative impacts on the efficiency and effectivity on the one-part
design of the yoke and the core are kept in check. This effect can
be further attenuated by the electromagnetic positioning device
acting like a proportional magnet working against a resilience
according to a preferred embodiment of the invention so that losses
ascribed to the short circuit are outside of the operational
characteristics in the power/lift diagram of the device and
therefore do not have any significant effect.
[0012] Overall, it is particularly advantageous if the core section
and/or the yoke section are/is longitudinally conically tapered in
their/its thickness towards the transition area and are/is
configured such that a load-displacement diagram of the positioning
device shows a linear progression via the lift when the current is
consistent in the spool.
[0013] It has proven to be particularly advantageous if the guide
pin recess is designed in the yoke-core bottom as an axial through
opening, in particular a through bore, which even more preferably
is sealed at the end, i.e. on the axial side facing away from the
anchor, by the guide pin. As will be described further on, a
preferably elastomeric abutment attenuation element, which can be
displaced in conjunction with the anchor, can be supported in the
axial direction, in particular at the bottom, in this sealed
opening or, in an alternative embodiment, at the bottom of a blind
bore opening, said anchor being supported in conjunction with said
abutment attenuation element in an abutment position towards the
core section, in particular on the front at the guide pin.
[0014] It is just as advantageous if the guide opening in the
anchor is also designed as a through opening, on the one hand for a
simplified production and on the other hand, in manner according to
the embodiment, for fixing a push rod or rather a push rod section
of the anchor to a, preferably sleeve-shaped, guide section
comprising a guide opening according to the invention and guided on
the sliding bearing (sliding bearing connection) on the outer
circumference.
[0015] By combining the aforementioned at least two bearing
functions in the yoke-core element and the preferably direct or
indirect terminal abutment function of the yoke-core bottom,
sophisticated geometries, which would be necessary from a
production perspective when realizing the functions independently
of each other, can be omitted and moreover less assembly space is
required.
[0016] It is particularly convenient for the invention if the
yoke-core element takes over another function besides the
aforementioned two bearing functions and serves as a holder for an
anti-twist pin, which is arranged adjacent to a longitudinal center
axis of the anchor and which protrudes into an anti-twist pin
recess parallel to the guide pin. In the embodiment of the
invention, this anti-twist pin is fixed in the yoke-core bottom
(adjacent to the guide pin, preferably at a distance thereto), in
particular in an anti-twist pin recess, it being particularly
preferred to press the anti-twist pin into said anti-twist pin
recess while additionally or alternatively also being able to be
welded or glued. It is particularly convenient for the invention to
design the anti-twist pin recess as a blind bore, which is sealed
at the end on the side of the anti-twist pin facing away from the
anchor. Preferably, the anti-twist pin opening, in which the
anti-twist pin engages during the displacement movement of the
anchor, in particular via its entire axial displacement path, is
also designed as a through bore in the anchor from a production
standpoint. Providing an anti-twist pin according to the invention
enables using the electromagnetic positioning device in the scope
of positioning systems, in which a torque is applied to the anchor
and acts to rotate the anchor around its displacement axis which
preferably coincides with its longitudinal center axis. In
particular when a high rotation speed is involved, such as it
occurs when using the electromagnetic positioning device in
conjunction with combustion engines and/or electric motors in motor
vehicles, the omission of an anti-twist device would lead to large
stresses and to a large wear of the positioning device. The design
of the anti-twist device as an anti-twist pin and the anchoring of
the anti-twist pin in the one-part yoke-core element, more
specifically in the yoke-core bottom, lead to a handy, easily
produced embodiment suitable for mass production.
[0017] As previously mentioned, it is particularly convenient if
the yoke-core bottom forms an axial abutment (terminal abutment)
for the anchor. Alternatively thereto, the yoke-core section can
form a support surface for an abutment attenuation element, which
can be optionally arranged in the interior, which is delimited by
the yoke-core element, between the front side of the anchor and the
yoke-core bottom.
[0018] In an alternative embodiment, the yoke-core bottom does not
form an axial abutment (terminal abutment) for the anchor; in this
alternative embodiment, however, the function of the axial abutment
is assumed by the guide pin, which is correspondingly dimensioned
long enough in the axial direction that the anchor is supported on
the guide pin directly or indirectly via a, preferably elastomeric,
abutment attenuation element when in a terminal abutment position.
This abutment attenuation element can be displaced back and forth
preferably in conjunction with the anchor and preferably fixed to
the anchor for this purpose. This can be realized by, for example,
the abutment attenuation element being pressed in the guide opening
in order to receive the guide pin. For this purpose, the guide
opening can be realized as a blind bore, it then being advantageous
if the abutment attenuation element is axially supported on the
blind bore bottom. In an alternative embodiment, in which the guide
opening is not realized as a blind bore but as a through opening,
which is sealed at the end side by a push rod section, in a
multipart anchor embodiment to be described further on, the
abutment attenuation element preferably is supported axially on a
front side of the push rod section received in the through opening.
It is generally possible to additionally or alternatively support
the abutment attenuation element axially on a circular shoulder or
a similar support surface of the guide opening independently of
realizing the guide opening as a through opening, in particular
sealed by a push rod section, or as a blind bore opening sealed at
the end side.
[0019] Additionally or alternatively to an abutment attenuation
element arranged in the guide opening as described above, at least
one abutment attenuation element can be provided on the front side
of the anchor facing away from the guide pin recess in the
yoke-core bottom, such an abutment attenuation element preferably
being fixed, in particular pressed in a front-side opening, on the
anchor so that the anchor can be supported in a terminal abutment
position on the axial side facing from the yoke-core bottom, in
particular on the side of the casing, via this abutment attenuation
element. The provision of abutment attenuation elements on both
axial sides of the anchor leads to an optimized noise
reduction.
[0020] It is also possible, in particular instead of providing an
abutment attenuation element in the guide opening, to arrange an
abutment attenuation element adjacent to the guide opening, in
particular fix it to the anchor, in order to support the anchor in
a terminal abutment position on the side of the yoke-core bottom
via the abutment attenuation element on the yoke-core bottom. A
loose arrangement of an abutment attenuation element between the
anchor and an immobile component of the positioning device is also
possible. It is also possible to realize an abutment attenuation
element so as to be fixed, in particular pressed in a component
opening, in particular in the yoke-core bottom, not on the anchor
but on an immobile component.
[0021] An embodiment is particularly preferred in which the
one-part yoke-core element has an additional function, namely by
serving as a holder or axial securing for a washer element, which
is fixed in an inner circumferential groove of the yoke-core
element in an embodiment of the invention and which is penetrated
by the anchor.
[0022] According to a first alternative, the washer element itself
can directly serve as a (direct) terminal abutment element axially
opposite the yoke-core bottom or alternatively as a carrier (direct
terminal abutment element) for an optional attenuation element for
attenuating the axial abutment. It is particularly preferable if
the washer element in the aforementioned inner circumferential
groove of the yoke-core element is fixed, i.e. axially secured, by
being axially tensioned, which is realized by the washer element
being able to be resiliently tensioned in the radial direction in
order to be inserted and then being able to be relaxed outward in
the radial direction in order to radially snap into place from the
inside out in the inner circumferential groove of the yoke-core
element. In an embodiment of the invention, this function can be
realized in particular by the washer element being realized as a
spring lock washer, namely from a material, particularly preferably
bronze, which does not conduct or only badly conducts the magnetic
flow. According to a first alternative, the washer element can be
received in a relaxed manner in the circular groove or
alternatively under a locking-spring force acting in the radial
direction when in the fixed position.
[0023] In particular in a preferred embodiment of the positioning
device, in which an axial anti-twist pin is provided besides the
axial guide pin, it is convenient if the anchor carries a ball
bearing, preferably realized as a rolling bearing, in its
positioning section, preferably realized in the shape of a push rod
(a component of the positioning partner being rolled off on the
rolling bearing relative to the anchor arranged in a torque-proof
manner, preferably having a high rotation speed, e.g. over 1,000
rpm).
[0024] As already indicated above, it is possible and preferable to
design the anchor as having multiple parts besides a generally
conceivable one-part design of the anchor, said multipart anchor
then preferably comprising a, preferably sleeve-shaped, guide
section, which preferably comprises a guide opening realized as a
through opening and on which a one-part or multipart push rod
section is fixed, which comprises or forms the positioning section
and which preferably has a smaller diameter than the guide section,
it being particularly convenient if sections of the push rod
section are received in the guide opening in a fixing manner, in
particular by being pressed in.
[0025] It is particularly preferable if the yoke-core element and
the spool unit, which radially surrounds the yoke-core element at
least in sections from the outside, are arranged in a shared
flow-conductive casing, which serves for the flow return.
Preferably, the casing is connected to the yoke section of the
yoke-core element via a yoke washer on the side axially opposite
the core section, said yoke washer preferably securing axially the
yoke-core element in the casing.
[0026] How the anchor is mounted can be further optimized according
to a preferred embodiment of the invention, in which the anchor is
supported on the guide pin via a sliding bearing, said (internal)
sliding bearing preferably being arranged, in particular pressed
in, in the guide opening of the anchor for this purpose.
Preferably, the internal sliding bearing is axially spaced from the
optional though preferably provided sliding bearing (external
sliding bearing) in order to guide the anchor on its outer
circumference, said external sliding bearing, as mentioned above,
preferably being fixed, in particular pressed in, in the yoke-core
element, in particular on the inner circumference of the yoke-core
element.
[0027] The invention also leads to a positioning system comprising
an electromagnetic positioning device realized according to the
invention as well as a positioning partner, which is preferably
realized so as to introduce a torque around the displacement axis
in the anchor, in particular via a rolling bearing fixed to the
anchor.
[0028] Further advantages, features and details of the invention
can be derived from the following description of preferred
exemplary embodiments as well as from the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In the following,
[0030] FIG. 1 illustrates a perspective longitudinal cut of a
preferred exemplary embodiment of an electromagnetic positioning
device realized according to the invention,
[0031] FIG. 2 illustrates an alternative preferred embodiment of a
positioning device according to the invention having an axial
abutment attenuation element fixed in a guide opening as well as
having an internal sliding bearing, and
[0032] FIG. 3 illustrates another alternative preferred embodiment
having abutment attenuation elements provided on both axial sides
of the anchor.
[0033] In the figures, the same elements and elements having the
same function are denoted with the same reference number.
DETAILED DESCRIPTION
[0034] In FIG. 1, an electromagnetic positioning device 1 realized
according to the invention is illustrated; said electromagnetic
positioning device 1 comprises a two-part anchor 2, which is
arranged so as to be axially displaceable along a displacement axis
V within a one-part yoke-core element 3, which is preferably
designed in general as a rotation-symmetric rotational part.
[0035] The yoke-core element 3 comprises a core section 5, which
comprises a yoke-core bottom 4, for coupling the magnetic flow in
the anchor as well as an essentially sleeve-shaped yoke section 6,
which extends parallel to the displacement axis V and which
radially surrounds the anchor 2 from the outside on the outer
circumference.
[0036] Besides the yoke-core bottom 4, the core section 5 comprises
a sleeve-shaped cone section 7, which forms an axial section of a
longitudinally cut transition area 8 reduced in thickness and
arranged between the core section 5 and the yoke section 6. It can
be seen that a spool unit 9 extends radially outward around the
transition area 8.
[0037] In the specific exemplary embodiment, the positioning device
1 is designed as a pull device and the anchor 2 has the function of
a pull anchor so that when the spool unit 9 is supplied with
current, the anchor 2 is displaced along the displacement axis V
towards the yoke-core bottom. The yoke-core bottom forms a direct
axial terminal abutment for delimiting the axial displacement axis
in this specific exemplary embodiment.
[0038] Preferably, a return spring, which can be supported on the
anchor 2 on the front side and which is not illustrated, is
provided for displacing the anchor 2 in the opposite axial
direction (positioning direction).
[0039] The yoke-core element 3 is received in a flow conductive,
preferably cup-shaped casing 10 in conjunction with the spool unit
9 and is axially secured therein via a yoke washer 11, which is
closely fit to the yoke section 6 from radially outward while
simultaneously axially securing said yoke section 6 and carrying it
between the yoke section and the casing 10 for a magnetic flow
conduction.
[0040] As previously mentioned the anchor 2 is designed in two
parts and comprises a sleeve-shaped guide section 12, which is
larger in diameter and which comprises a guide opening 13 realized
as a through opening, in which a positioning section 14, which is
realized as a push rod section of the anchor 2, is pressed in on an
end side. The positioning section 14 carries an only partially
illustrated rolling bearing 15 in its axial end section, a
positioning partner being able to roll off on said rolling bearing
15 in the circumferential direction around the displacement axis V.
In order to prevent a drag torque caused thereby from rotating the
anchor 2 around the displacement axis V in the circumferential
direction, an anti-twist pin 16 is provided which will be described
further on.
[0041] On the side facing away from the positioning section 14, an
axial guide pin 17 protrudes in the guide opening 13 and is fixed
in a centric guide pin recess 18 in the yoke-core bottom 4, said
guide pin opening 18 being realized as a through opening, and is
centrically penetrated by the displacement axis V, just like the
centric guide opening 13. The guide pin 17 is made of a magnetic
nonconductive material and serves for guiding the anchor 2 on the
inner circumference of the guide opening 13.
[0042] The aforementioned anti-twist pin 16 is arranged having a
radial distance to the guide pin 17 and is held in an eccentrically
arranged anti-twist pin recess 19 in the yoke-core bottom 4 by
being pressed in, said anti-twist pin recess 19 also being realized
as a through opening. The anti-twist pin 16 engages in an
anti-twist pin opening 20, which is also realized as a through
opening and which extends parallel to the centric guide opening 13,
in the guide section of the anchor 2 and thus prevents the anchor 2
from rotating in the circumferential direction.
[0043] Parallel to the anti-twist pin opening, a compensation
opening (through opening), which has the same size in this example,
is provided in the guide section 12 of the anchor 2 in order to
compensate pressure between the cylinder spaces within the
yoke-core element 3 delimited by the front sides of the guide
section 12 upon a displacement movement.
[0044] In order to guide the anchor 2, more specifically the guide
section 12 on its outer circumference, a sliding bearing 21
realized as a sliding bearing connection is provided which is
arranged on the inner circumference of the yoke section 6 of the
yoke-core element 3. The sliding bearing 21 is axially secured by a
step 23, which is realized on the inner circumference of the
yoke-core element 3 and which abuts against a circumferential
support surface 24 for the sliding bearing 21.
[0045] The guide section 12 of the anchor 2 is axially secured in
the yoke-core element 3 by a magnetically nonconductive washer
element 25 which radially outward engages resiliently in an inner
circumferential groove 26 in the yoke section 6. A centric opening
26 in the washer element 25 is penetrated by the push-rod-shaped
positioning section 14 of the anchor 2; the guide section 12 of the
anchor 2 can axially abut against the washer element 25, which
functions according to the principle of a spring lock washer, with
its front side facing away from the yoke-core body 4.
[0046] The yoke-core element 3 of the illustrated positioning
device 1 represents the basis of a multifunctional assembly, which
carries the guide pin 17 fixed in the yoke-core bottom 4 and the
anti-twist pin 16 also fixed in the yoke-core bottom 4 as well as
the sliding bearing 21 for guiding the anchor 2 on its outer
circumference. Furthermore, the yoke-core element 3 serves for
holding the washer in a clamping manner, said washer being
penetrated by the anchor 2 and delimiting the axial movement of the
anchor 2 on the axial side facing away from the yoke-core bottom
4.
[0047] The very compact design according to the invention enables
using the available assembly space for increasing the magnetic
performance.
[0048] In the following, alternative embodiments also realized
according to the invention are described, with particular emphasis
on the differences to the embodiments according to FIG. 1. In order
to avoid repetitions, the description of figures above is referred
to regarding any similaripulls.
[0049] The anchor 2 of the electromagnetic positioning device 1
according to FIG. 2 can be realized as having one part, for
example. In this instance, the guide opening 13 is designed as a
blind bore for receiving the guide pin 17, preferably as
illustrated. In this blind bore, an abutment attenuation element 29
is pressed in, via which the anchor 2 can be supported on the guide
pin 17 on the front side in a terminal abutment position, which is
lower according to the drawing plane. In contrast to the exemplary
embodiment described above, the yoke-core element 4 does not form a
terminal abutment in the illustrated embodiment. This function of
the terminal abutment is directly adopted by the guide pin 17.
[0050] Another difference of the exemplary embodiment according to
FIG. 2 is in the provision of an internal sliding bearing 30 (which
can also be provided in the embodiment according to FIG. 1)
additionally to the (external) sliding bearing 21 in this instance.
The internal sliding bearing 30 is pressed in the guide opening 13
realized as a blind bore opening in a merely exemplary manner and
thus moves axially in conjunction with the anchor 2 and guides the
anchor 2 on the outer circumference of the centrically arranged
guide pin 17 during this axial movement.
[0051] In the alternative embodiment according to FIG. 3, another
abutment attenuation element 31, designed circular in this instance
for example, is arranged on the axial side of the anchor 2 facing
away from the guide opening 13 or, in other words, on an axial side
of the anchor 2 facing away from the yoke-core bottom 4 in addition
to the abutment attenuation element 29 arranged in the guide
opening 13 also realized as a blind bore opening in an exemplary
manner. The abutment attenuation element 31 is pressed in an
opening, which is shaped like a circular groove for example, in a
circular shoulder of the anchor 2 and serves for attenuating the
anchor abutment in its abutment position, which is higher according
to the drawing, said anchor 2 being axially supported on the washer
element 25 via the circular-groove-shaped abutment attenuation
element 31 in said abutment position. In this embodiment according
to FIG. 3, the internal sliding bearing 30 is also provided in
order to guide the anchor on the outer circumference of the guide
pin 17.
[0052] It is explicitly noted that the features and functions added
in FIGS. 2 and 3 can be combined individually and in any other
combination with features of the respective other exemplary
embodiments.
[0053] Hence, the embodiment according to FIG. 3 can also be
carried out having an anti-twist pin, for example, in order to
prevent a rotation of the anchor 2, in particular should a rolling
bearing be arranged on the anchor.
LIST OF REFERENCES
[0054] 1 electromagnetic positioning device [0055] 2 anchor [0056]
3 yoke-core element [0057] 4 yoke core bottom [0058] 5 core section
[0059] 6 yoke section [0060] 7 cone section [0061] 8 transition
area [0062] 9 spool unit [0063] 10 casing [0064] 11 yoke washer
[0065] 12 guide section [0066] 13 guide opening [0067] 14
positioning section [0068] 15 rolling bearing [0069] 16 anti-twist
pin [0070] 17 guide pin [0071] 18 guide pin recess [0072] 19
anti-twist pin recess [0073] 20 anti-twist pin opening [0074] 21
sliding bearing [0075] 23 step [0076] 24 support surface [0077] 25
washer element [0078] 26 inner circumferential groove [0079] 27
opening [0080] 28 compensation bore [0081] 29 abutment attenuation
element [0082] 30 sliding bearing [0083] 31 circular abutment
attenuation element [0084] V displacement axis
* * * * *